import type { BackendRegistry } from "./types.js";
/**
 * Dynamically import a backend plugin package and register it.
 *
 * The package must export a `registerBackends(registry)` function that
 * calls `registry.register()` with one or more {@link BackendFactory}
 * descriptors.
 *
 * @param specifier - npm package name or local file path
 * @param registry - the BackendRegistry to register into
 * @param options - optional settings
 * @param options.cwd - directory to resolve specifiers from (defaults to `process.cwd()`)
 * @throws if the import fails, the module lacks a register export,
 *         or registration itself throws (e.g. duplicate name)
 */
export declare function loadBackendPlugin(specifier: string, registry: BackendRegistry, options?: {
    cwd?: string;
}): Promise<void>;
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